As the economy plummets to dramatic lows, the stress levels of Americans -- and possibly their susceptibility to cold and flu -- are soaring to stratospheric highs.
"My best guess is that those most impacted by the economic downturn will be at greater risk [of cold and flu]," said Sheldon Cohen, a professor of psychology at Carnegie Mellon University in Pittsburgh, and one of the country's leading experts on the relationship between stress and vulnerability to viral infections.
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